Concentration of Risk and Segment Data (Segment Assets) (Details 4) - USD ($) $ in Thousands	Nov. 30, 2016	Aug. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 10,543,846	$ 10,322,677
EMS [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	2,768,080	2,615,237
DMS [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	5,010,360	5,012,798
Other non-allocated assets
Segment Reporting Asset Reconciling Item [Line Items]
Assets	$ 2,765,406	$ 2,694,642